Edward a



Dec; 22 I. 1925.

E. A. SCHOLTZ THERMOSTATIC CONTROL Filed April 22 .lv-..11 l

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ATTORNEYS,

BST AWlU'BUE CGP) Patented Dec. 2.2, 1925.

UNITED sra'rssV AEDW'ABfD A. SCHOLTZ, 0F SAN FRANCISCO, CALIFORNIA.

rnnnuos'ra'rrc CONTROL.

Application tiled April 22, 1924. Serial No. .708,258..

Be it known that I, EDWARD A. Sorronrz, a citizen of the United-States, and a resident of.San Francisco, county of San Francisco',

.5 .and State of California, have invented a new and'fuseful Thermostatic Control, of which the following is a specification.

. The present invention relates to improvements'ina thermostatic control for electric 1Q elements, and its particular object is to prouse toir'elnl the chamber.

vide'a control for an electric circuit that will automatically maintain waterheaters, glue kettles', barber, hospital and restaurant heating supplies and similar devices at a desired temperature. It is particularly proposedin 'the present invention to provide a device vofgthis character that is very simple in .construction and very accurate in its ac tion.'v yFurther objects and advantages of my device will appear as the specification proceeds;

The preferred form of the device is illustrated. in the accompanying drawing, in which Figure 1 shows a vertical section through my thermostatic control as attached to a vessel, Figure 2 a front view of the same, and Figure 3 a detail view of-acontact supporting lever used in my device. While I have shown only the preferred form of the invention, it should be understood that various changes or modifications may be made within the scope of the claims hereto' attached without departing from the spirit of the invention.

The vessel (1) which may be filled with water or any other liquid to be heated and to be maintained at a certain temperature, has va heating element (2) threaded 'into the wall of the same as shown at 3) with a plug (4) connecting the two wires (6) with the electrodes (7) of the heating element.

. The wall of the vessel has two concave diaphragme (8) and (9) embodied therein vwhich form a chamber (11) adapted to be filled with a liquid lthrough the tu e (12) which latter may be sealed after the hamber and the tube have been completely lled by lmeans of a soft metal ada ted td be .re-

moved with the aid of a diill in case it should become necessary after several years The oute'rdiaphragm (9) has a disk (13) secured to its central portion, and m the disk` extends a short bar v(14s). .into perfol ration (15) in the lever (16), .which latter pin (17).l

A. plate (18) extends diametricallY across is pivoted in the bar by means cfa the diaphragm within the 'cylinder 9) extending laterally from the vesselso as to surround the space occupied by the dia-v phragms, and is made to b ear on the disk (13) and through the same on the dia phragm (9) by means of a screw (2l) bearing on one end of the plate and a spring (22) lbearing' on the other end of the plate.

he screw is threaded into a bar (23) stretched diagonally across the outer end of the cylinder, while the spring (22)'is held in place by means of a lip (24) extending inwardly from the outer end of the cylinder.

The lever (16) previously mentioned has a contact (26) mounted on the lower end thereof and one ofthe wires (6) is in metallic connection with this contact, A screw (27 threaded into' thel diagonal member (23 bears upon the outer 'face of this lever between 4its pivot (17) andthe contact (26), the lever being recessed for this purpose as shown at The other en'd of the'lever has a roller (28) .preferably made of glass or some other suitable insulating material supported thereon with freedom of rotary motion, which latter roller contacts an arm (29) pivoted in the insulating block (31) as shown at (32) in close proximity to said pivot. The arm (29) is of substantially the vsame length as the lever (16) and supports at its free end a contact (33 which atter confronts the contact (26). oth of these contacts are preferably screwed into their supports so that their normal distance from one another may be regulated.

A spring (34), one end of which is. secured in the cylinder (19) as shown at 36) runs substantially parallel to the arm and supports at its end a glass roller bearing on the arm (29) and tendin force the two contacts (26) and (33) together. The arm (29) is preferably bent in the manner shown' in Flgure 2 so as to render the screw (27) accessible.

The operation of the device is as follows:

Normally the two contacts (26) and (33) touch one another, due tothe action of the spring (34) which bearing on the free end of the arm (29) forces the contact supported on said arm in the direction of the other.

contact. The spring action is atthe same vtime transmitted through the `roller (28) eser warmere com force the contact (26) toward the contact (33) so that the two contacts are normally touching. f

If the heat of 'the liquid in the vessel (l) begins to exceed a predetermined ternperature and the liquid in the chamber (11) expands beyond va predetermined decree, the

expanding diaphra'm- (9) forces the pivot (17) to swin the ever (16) on the point of the screw 27) in such a manner that the contact (26) recedes from thc contact (33), while-at the saine time through the action of the roller (28) on the arm (29) the contact (33) is made to recede in the opposite direction so that both contacts recede from the normal position and open the electrical circuit of the heating element.

The exact point at which the control respondsv may be regulated by setting the Iscrew (27) as Well asV by changing the tensin of the spring (22) by manipulating the screw (21').

I claim:

l. In a. thcrmostatic control, a heat responsive element,'a lever fulcrurned to follow4 the inotionso said element, means for arresting the motion of o ne end of said lever and an arm Apivoted near the freeend of the lever having' a contact thereon and allowing the free end of the-lever to operate the same for opening and closing an electric circuit.

2. In a thermostatic control, aheat relow the motion osaid element, an adjustable memberyhearing on one end of the lever for arresting the motion of the same, and an arm ivotcd 4near the free end of the lever having a contact thereon and allowing the f ree end ofthe lever to operate the same for opening andclosinfc,r an electric circuit.

3. In a thermostatic control, a heat re.- sponsive clement` a lcv'er fulcrumed to follow the motions of said element, means for arresting the motion of one end of said lever, and an arm pivoted near the free end of the lever having a contact therein andv yielding means associated therewith for urging the contact toward a second contact, the free end of the lever hearing' on the arm near the pivot thereof for separating the contacts when the heat reslrnsiye ,element expands.

4. -In -a`thermos1z`itic control, a heat responsive clement, a lever ulcrumed to follow the motions of said element, an adjustable. member bearing on one end of the lever for arresting the motion of the salne, and an ann pivotcd near the free end of the lever having a. Contact thereon and'yielding means associated therewith for urging the contact toward a second contact, the free -end of the lever bearing on the arm near the point thereof'for separating the contacts when the heat responsive element expands.

EDWARD A. SCHOLTZ.

vto the lever (i6) and has a 'tendency to sppnsire element, a lever fulcrurned to fol- 35 

